322 DIPTERA. 
5. Spilogaster signatipennis, sp.n., ¢ ¢. (Tab. VIII. figg.6, ¢; 6a, head 
in profile, 3 .) 
Cinereous ; antenne, four thoracic stripes, and four spots on the abdomen, black ; legs black, with yellowish tibie 
(3), or rufous, with black tarsi ( 2); cross-veins of the wings bordered with black; eyes contiguous (d ). 
Length 6 millim. 
Front in the male triangular, the eyes subcontiguous ; in the female the front as broad as the eyes, cinereous, 
with the frontal band black, divided into two stripes. Face and cheeks whitish-grey, the face short ; 
vibrissx at the oral margin, which is slightly prominent; lower part of the cheeks equalling one-third ( ¢) 
or one-fourth (  ) of the longitudinal diameter of the eyes; a row of bristles on the underside of the head. 
Antennz black, inserted nearly on the median line of the eyes ; second joint with a pair of small bristles ; 
third joint more than twice as long as the second ; arista moderately plumose. Proboscis and palpi 
black, the palpi sometimes clearer. Thorax and scutellum cinereous; thoracic dorsum with four black 
stripes, which are most conspicuous before the transverse suture; two dorso-central bristles before and 
three behind the suture ; mctanotum grey. Abdomen cinereous, conical ( 2) or elongate-oval (2); base 
of the first segment, two large spots on the second and two others on the third segment, brownish- 
black ; a brown interrupted dorsal line is more or less distinct ; macrochete present at the hind margin 
of the third segment and on the anal segment, but in the male less conspicuous among the bristly hairs 
of the abdomen. Legs slender, in the male black, with the tibie yellowish-testaceous ; in the female the 
femora towards the tip and the tibie are rufous; front femora with a row of bristles on the upper and 
under sides; foot-claws and pulvilli elongate in the male, the pulvilli yellowish. Tegule yellowish-grey 
(&), more whitish (2). Wings brownish-byaline, with a small costal spine; small and posterior cross- 
veins bordered with black; small cross-vein nearly under the end of the first vein and a little beyond the 
middle of the discal cell; third and fourth veins parallel towards the end; terminal section of the fourth 
vein nearly twice as long as the penultimate section ; posterior cross-vein somewhat angularly concave. 
Hab. Mexico, Chilpancingo, Xucumanatlan, Omilteme, and Sierra de las Aguas 
Escondidas, all in Guerrero, 4600 to 9500 feet (1. H. Smith), Orizaba (H. 1. Smith 
and F. D. Godman). 
Several specimens of both sexes. 
6. Spilogaster discreta, sp. n., ¢ (? 2). 
Cinereous; four thoracic stripes, four spots on the abdomen, antenne, palpi, and legs, black, the knees and 
tibie testaceous; cross-veins bordered wita black; eyes ( ¢) separated by a linear front. 
Length 5-6 millim. 
Very like the preceding (S. signatipennis), but differing in the male sex in having a narrow white front 
distinctly separating the eyes and showing a linear black frontal band; the tegule are whitish and the 
posterior cross-vein is not concave, but nearly straight. © 
Hab. Mexico, Amula 6000 feet and Xucumanatlan 7000 feet, both in Guerrero 
(H. H. Smith). 
A single male from each locality. 
Two female specimens from Amula agree with the corresponding sex of S. signati- 
pennis, but have the posterior cross-vein more in a straight line; they may therefore 
be considered as belonging to S. discreta. 
HYDROTAA. 
Hydrotea, Robineau-Desvoidy, Essai sur les Myodaires, p. 509 (1830). 
The males of this genus may be easily recognized by the form of the front legs, 
